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Neglected no longer: Phylogenomic resolution of higher-level relationships in Solifugae. | LitMetric

AI Article Synopsis

  • Advanced sequencing technologies have significantly improved our understanding of higher-level relationships among arthropods, but some groups, especially those in hidden habitats, still present challenges.
  • The Solifugae, or "camel spiders," remain the only order of chelicerates without a clear phylogeny due to difficulties in accessing key morphological traits and limited molecular research.
  • A new phylogenomic study utilizing ultraconserved elements has successfully clarified solifuge relationships, revealing two main groups of New World taxa within a broader Paleotropical context, and suggesting that divergence among families occurred mostly before the Paleogene-Cretaceous extinction, influenced by continental shifts.

Article Abstract

Advanced sequencing technologies have expedited resolution of higher-level arthropod relationships. Yet, dark branches persist, principally among groups occurring in cryptic habitats. Among chelicerates, Solifugae ("camel spiders") is the last order lacking a higher-level phylogeny and have thus been historically characterized as "neglected [arachnid] cousins". Though renowned for aggression, remarkable running speed, and xeric adaptation, inferring solifuge relationships has been hindered by inaccessibility of diagnostic morphological characters, whereas molecular investigations have been limited to one of 12 recognized families. Our phylogenomic dataset via capture of ultraconserved elements sampling all extant families recovered a well-resolved phylogeny, with two distinct groups of New World taxa nested within a broader Paleotropical radiation. Divergence times using fossil calibrations inferred that Solifugae radiated by the Permian, and most families diverged prior to the Paleogene-Cretaceous extinction, likely driven by continental breakup. We establish Boreosolifugae uniting five Laurasian families, and Australosolifugae uniting seven Gondwanan families using morphological and biogeographic signal.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10484990PMC
http://dx.doi.org/10.1016/j.isci.2023.107684DOI Listing

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